Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a10a6c790196e2c…

MALICIOUS

PDF

87.3 KB Created: 2021-06-12 17:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 220145ccceb36719d8fe7ef396b6a7d9 SHA-1: c0ad0ce650c303aa5fbed96d60312e8a2e757325 SHA-256: 9a10a6c790196e2c9a31b8e52137dc7975befa4f2004f7cc61ac21873b35753b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=diamond+hacker+free+fire+app PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5c3febb8c718c57a8d2b0688d171759e/54943609775.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/novadalefofefowu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab1134f3c---83397570280.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/06178d1e2be8ba62b362c2c836611e01/kujutonimosolelirixozi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8e96fefb---fixanitoni.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98624883237.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/namamuwapaxipisivegas.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983894dd66c---33047718696.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad655e5c74f---32502488160.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b2d29c9f7b4e601ae1559d8b82b315c7/31505866159.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d09i9uvdvjip7jrpqpeclh4f5c/39307718370.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/hss22ndenjch1tparvjoo528tq/vedudixajejofininosi.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/tifuvaxuk.pdfIn PDF document text
    • http://synowka.pl/galeria/file/wadifimiwimineb.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070573b72fda---67033948000.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607124201427a---98570224226.pdfIn PDF document text
    • http://teplospectr.ru/images/files/delogivamorokebuvo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/shkij0ijkmfvu94b8vjlbsmv8l/60778451268.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 5248 bytes
SHA-256: b444804e124c044fa1806abf5d2d905d3da9664ce3085aa08467837bc5a6a23a
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 3928 bytes
SHA-256: 9f0e641fd2357051dee898db79e25f4623cfe2a6b6d01fc00a25e3f2af88963a
font_02_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10804 bytes
SHA-256: f5b6a834ca1d3cf41fa7316d7c525c99ace51f49b2b7c4b0ec140375fb299c76
font_03_sfnt_off0001365b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 17216 bytes
SHA-256: f534564025b51d2f658fc52075b1ed282d1b4712a19b620bcdf80fdf1753f43d

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